This dua is to be recited after adhaan
Allahumma rabba hadhihi-d-da’awati-t-tammati wa-s-Salati-l-qa’imati, ati Muhammadan il-wasilata wa-l-fadilata (wa-d-darajata-r-rafi’ati) wa-b‘ath-hu maqamam mahmudan illadhi wa‘adtahu
Reference : Sahih al-Bukhari 614
But almost everyone adds this extra verse when reciting that is not part of the dua.
(innaka la tukhliful mi’ad)
I heard that this is an innovation, since it's not part of the dua. Like some say
sadaqallahul azim after reciting Quran.
So is saying (innaka la tukhliful mi’ad) with that dua an innovation?